Explanation:

- Initially, consider the given numbers: 369, 717, 922, 625, 434.

- Interchange the first and third digits of each number:

- 369 becomes 963

- 717 becomes 717

- 922 becomes 229

- 625 becomes 526

- 434 becomes 434

- Now, order the numbers from lowest to highest: 229, 434, 526, 717, 963.

- Identify the third lowest number, which is 526.

- The first digit of 526 is 5, and the second digit is 2.

- Sum the first and second digits: 5 + 2 = 7.

$$ \color{green} \text{Option 5: 7 } $$ is the correct answer.